I Turned Hundreds of PSD Files into HTML. Here Are the 10 Biggest Mistakes Developers Still Make

For the last several years, I've worked on converting PSD designs into production-ready HTML for agencies and businesses.

One thing surprised me:

Even experienced developers often repeat the same mistakes that hurt website performance, responsiveness, and maintainability.

Here are the biggest ones I see:

✅ Using absolute positioning for entire layouts

✅ Ignoring semantic HTML

✅ Writing CSS that's impossible to maintain

✅ Not optimizing images before development

✅ Forgetting accessibility (ARIA labels, alt text, keyboard navigation)

✅ Pixel-perfect desktop layouts that completely break on mobile

✅ Using too many nested divs

✅ Hardcoding spacing instead of creating reusable components

✅ Ignoring Core Web Vitals during development

✅ Skipping browser compatibility testing

Over time, I've found that spending a little more effort during HTML conversion saves hours of debugging later.

I recently documented my complete PSD-to-HTML workflow—from slicing the design to writing clean, responsive, SEO-friendly code.

I'd love feedback from other developers:

What's the biggest mistake you've seen during PSD/Figma → HTML conversion?

If anyone wants the full step-by-step tutorial, you can find it here: